2x/2=(6-3y)/2?
I solved it for you in my initial answer.
The 2 in the numerator cancels with the 2 in the denominator on th left side and
x = (6-3y)/2 which is the solution of the initial equation you had for x in terms of y.
You CAN divide 2 into both 6 and -3y on the right if you wish to give
x = (6/2) - (3y)/2 = 3 - (3y)/2